Lighting device



FIG. 1 is a top, front and left side perspective view of a lighting device showing my new design;

FIG. 2 is a right side evational view thereof, the left side elevational view being a mirror image;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing the environment in some of the figures are for illustrative purpose only and form no part of the claimed design. 

The ornamental design for a lighting device, as shown and described. 